372 lines
13 KiB
C#
372 lines
13 KiB
C#
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/*
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Copyright (C) 2011 de4dot@gmail.com
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This file is part of de4dot.
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de4dot is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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de4dot is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with de4dot. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Reflection;
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using System.Reflection.Emit;
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using Mono.Cecil;
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using Mono.Cecil.Cil;
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using de4dot.blocks;
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using OpCode = Mono.Cecil.Cil.OpCode;
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using OpCodes = Mono.Cecil.Cil.OpCodes;
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using ROpCode = System.Reflection.Emit.OpCode;
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using ROpCodes = System.Reflection.Emit.OpCodes;
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namespace AssemblyData.methodsrewriter {
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delegate object RewrittenMethod(object[] args);
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class MethodsRewriter : IMethodsRewriter {
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Dictionary<Module, MModule> modules = new Dictionary<Module, MModule>();
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Dictionary<MethodBase, NewMethodInfo> realMethodToNewMethod = new Dictionary<MethodBase, NewMethodInfo>();
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List<NewMethodInfo> newMethodInfos = new List<NewMethodInfo>();
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class NewMethodInfo {
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// Original method
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public MethodBase oldMethod;
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public Type delegateType;
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// The modified code is here
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public Delegate delegateInstance;
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// newMethodInfos index
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public int delegateIndex;
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public RewrittenMethod rewrittenMethod;
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public NewMethodInfo(MethodBase oldMethod) {
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this.oldMethod = oldMethod;
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}
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}
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MModule loadAssembly(Module module) {
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MModule info;
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if (modules.TryGetValue(module, out info))
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return info;
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info = new MModule(module, ModuleDefinition.ReadModule(module.FullyQualifiedName));
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modules[module] = info;
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return info;
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}
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MModule getModule(ModuleDefinition moduleDefinition) {
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foreach (var mm in modules.Values) {
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if (mm.moduleDefinition == moduleDefinition)
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return mm;
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}
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return null;
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}
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MModule getModule(AssemblyNameReference assemblyRef) {
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foreach (var mm in modules.Values) {
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var asm = mm.moduleDefinition.Assembly;
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if (asm.Name.FullName == assemblyRef.FullName)
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return mm;
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}
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return null;
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}
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MModule getModule(IMetadataScope scope) {
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if (scope is ModuleDefinition)
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return getModule((ModuleDefinition)scope);
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else if (scope is AssemblyNameReference)
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return getModule((AssemblyNameReference)scope);
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return null;
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}
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MType getType(TypeReference typeReference) {
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var module = getModule(typeReference.Scope);
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if (module != null)
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return module.getType(typeReference);
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return null;
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}
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MMethod getMethod(MethodReference methodReference) {
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var module = getModule(methodReference.DeclaringType.Scope);
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if (module != null)
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return module.getMethod(methodReference);
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return null;
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}
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MField getField(FieldReference fieldReference) {
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var module = getModule(fieldReference.DeclaringType.Scope);
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if (module != null)
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return module.getField(fieldReference);
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return null;
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}
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public object getRtObject(MemberReference memberReference) {
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if (memberReference is TypeReference)
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return getRtType((TypeReference)memberReference);
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else if (memberReference is FieldReference)
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return getRtField((FieldReference)memberReference);
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else if (memberReference is MethodReference)
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return getRtMethod((MethodReference)memberReference);
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throw new ApplicationException(string.Format("Unknown MemberReference: {0}", memberReference));
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}
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public Type getRtType(TypeReference typeReference) {
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var mtype = getType(typeReference);
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if (mtype != null)
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return mtype.type;
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return Resolver.resolve(typeReference);
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}
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public FieldInfo getRtField(FieldReference fieldReference) {
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var mfield = getField(fieldReference);
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if (mfield != null)
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return mfield.fieldInfo;
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return Resolver.resolve(fieldReference);
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}
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public MethodBase getRtMethod(MethodReference methodReference) {
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var mmethod = getMethod(methodReference);
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if (mmethod != null)
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return mmethod.methodBase;
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return Resolver.resolve(methodReference);
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}
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public Type getDelegateType(MethodBase methodBase) {
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return realMethodToNewMethod[methodBase].delegateType;
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}
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public RewrittenMethod createDelegate(MethodBase realMethod) {
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var newMethodInfo = realMethodToNewMethod[realMethod];
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if (newMethodInfo.rewrittenMethod != null)
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return newMethodInfo.rewrittenMethod;
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var dm = new DynamicMethod("method_" + newMethodInfo.oldMethod.Name, typeof(object), new Type[] { GetType(), typeof(object[]) }, GetType(), true);
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var ilg = dm.GetILGenerator();
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ilg.Emit(ROpCodes.Ldarg_0);
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ilg.Emit(ROpCodes.Ldc_I4, newMethodInfo.delegateIndex);
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ilg.Emit(ROpCodes.Call, GetType().GetMethod("rtGetDelegateInstance", BindingFlags.DeclaredOnly | BindingFlags.NonPublic | BindingFlags.Instance));
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var args = newMethodInfo.oldMethod.GetParameters();
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for (int i = 0; i < args.Length; i++) {
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var arg = args[i].ParameterType;
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ilg.Emit(ROpCodes.Ldarg_1);
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ilg.Emit(ROpCodes.Ldc_I4, i);
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ilg.Emit(ROpCodes.Ldelem_Ref);
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if (arg.IsValueType)
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ilg.Emit(ROpCodes.Unbox_Any, arg);
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else
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ilg.Emit(ROpCodes.Castclass, arg);
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}
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ilg.Emit(ROpCodes.Ldarg_0);
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var flags = BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.Instance;
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var invokeMethod = newMethodInfo.delegateType.GetMethod("Invoke", flags);
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ilg.Emit(ROpCodes.Call, invokeMethod);
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if (ResolverUtils.getReturnType(newMethodInfo.oldMethod) == typeof(void))
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ilg.Emit(ROpCodes.Ldnull);
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ilg.Emit(ROpCodes.Ret);
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newMethodInfo.rewrittenMethod = (RewrittenMethod)dm.CreateDelegate(typeof(RewrittenMethod), this);
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return newMethodInfo.rewrittenMethod;
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}
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public void createMethod(MethodBase realMethod) {
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if (realMethodToNewMethod.ContainsKey(realMethod))
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return;
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var newMethodInfo = new NewMethodInfo(realMethod);
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newMethodInfo.delegateIndex = newMethodInfos.Count;
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newMethodInfos.Add(newMethodInfo);
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realMethodToNewMethod[realMethod] = newMethodInfo;
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var moduleInfo = loadAssembly(realMethod.Module);
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var methodInfo = moduleInfo.getMethod(realMethod);
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if (!methodInfo.methodDefinition.HasBody || methodInfo.methodDefinition.Body.Instructions.Count == 0)
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throw new ApplicationException(string.Format("Method {0} ({1:X8}) has no body", methodInfo.methodDefinition, methodInfo.methodDefinition.MetadataToken.ToUInt32()));
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var codeGenerator = new CodeGenerator(this);
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codeGenerator.setMethodInfo(methodInfo);
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newMethodInfo.delegateType = codeGenerator.DelegateType;
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var blocks = new Blocks(methodInfo.methodDefinition);
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foreach (var block in blocks.MethodBlocks.getAllBlocks())
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update(block, newMethodInfo);
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IList<Instruction> allInstructions;
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IList<ExceptionHandler> allExceptionHandlers;
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blocks.getCode(out allInstructions, out allExceptionHandlers);
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newMethodInfo.delegateInstance = codeGenerator.generate(allInstructions, allExceptionHandlers);
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}
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static Instruction create(OpCode opcode, object operand) {
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return new Instruction {
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OpCode = opcode,
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Operand = operand,
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};
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}
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// Inserts ldarg THIS, and returns number of instructions inserted at 'i'
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int insertLoadThis(Block block, int i) {
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block.insert(i, create(OpCodes.Ldarg, new Operand(Operand.Type.ThisArg)));
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return 1;
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}
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int insertCallOurMethod(Block block, int i, string methodName) {
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block.insert(i, create(OpCodes.Call, new Operand(Operand.Type.OurMethod, methodName)));
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return 1;
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}
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void update(Block block, NewMethodInfo currentMethodInfo) {
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var instrs = block.Instructions;
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for (int i = 0; i < instrs.Count; i++) {
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var instr = instrs[i];
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if (instr.OpCode == OpCodes.Newobj) {
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var ctor = (MethodReference)instr.Operand;
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if (MemberReferenceHelper.verifyType(ctor.DeclaringType, "mscorlib", "System.Diagnostics.StackTrace")) {
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insertLoadThis(block, i + 1);
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insertCallOurMethod(block, i + 2, "static_rtFixStackTrace");
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i += 2;
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continue;
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}
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}
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if (instr.OpCode == OpCodes.Call || instr.OpCode == OpCodes.Callvirt) {
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var calledMethod = (MethodReference)instr.Operand;
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if (DotNetUtils.isSameAssembly(calledMethod.DeclaringType, "mscorlib")) {
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if (calledMethod.ToString() == "System.Reflection.Assembly System.Reflection.Assembly::GetAssembly(System.Type)") {
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block.replace(i, 1, Instruction.Create(OpCodes.Nop));
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insertLoadThis(block, i + 1);
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insertCallOurMethod(block, i + 2, "static_rtGetAssembly_TypeArg");
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i += 2;
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continue;
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}
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else if (calledMethod.ToString() == "System.Reflection.Assembly System.Reflection.Assembly::GetCallingAssembly()" ||
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calledMethod.ToString() == "System.Reflection.Assembly System.Reflection.Assembly::GetEntryAssembly()" ||
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calledMethod.ToString() == "System.Reflection.Assembly System.Reflection.Assembly::GetExecutingAssembly()") {
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block.replace(i, 1, Instruction.Create(OpCodes.Nop));
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insertLoadThis(block, i + 1);
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block.insert(i + 2, Instruction.Create(OpCodes.Ldc_I4, currentMethodInfo.delegateIndex));
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insertCallOurMethod(block, i + 3, "rtGetAssembly");
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i += 3;
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continue;
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}
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}
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var method = getMethod((MethodReference)instr.Operand);
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if (method != null) {
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createMethod(method.methodBase);
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var newMethodInfo = realMethodToNewMethod[method.methodBase];
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block.replace(i, 1, Instruction.Create(OpCodes.Nop));
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int n = i + 1;
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// Pop all pushed args to a temp array
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var mparams = getParameters(method.methodDefinition);
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if (mparams.Count > 0) {
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block.insert(n++, Instruction.Create(OpCodes.Ldc_I4, mparams.Count));
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var objectType = method.methodDefinition.Module.TypeSystem.Object;
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block.insert(n++, Instruction.Create(OpCodes.Newarr, objectType));
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block.insert(n++, create(OpCodes.Stloc, new Operand(Operand.Type.TempObjArray)));
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for (int j = mparams.Count - 1; j >= 0; j--) {
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var argType = mparams[j];
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if (argType.IsValueType)
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block.insert(n++, Instruction.Create(OpCodes.Box, argType));
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block.insert(n++, create(OpCodes.Stloc, new Operand(Operand.Type.TempObj)));
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block.insert(n++, create(OpCodes.Ldloc, new Operand(Operand.Type.TempObjArray)));
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block.insert(n++, Instruction.Create(OpCodes.Ldc_I4, j));
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block.insert(n++, create(OpCodes.Ldloc, new Operand(Operand.Type.TempObj)));
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block.insert(n++, Instruction.Create(OpCodes.Stelem_Ref));
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}
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}
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// Push delegate instance
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insertLoadThis(block, n++);
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block.insert(n++, Instruction.Create(OpCodes.Ldc_I4, newMethodInfo.delegateIndex));
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insertCallOurMethod(block, n++, "rtGetDelegateInstance");
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block.insert(n++, create(OpCodes.Castclass, new Operand(Operand.Type.ReflectionType, newMethodInfo.delegateType)));
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// Push all popped args
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if (mparams.Count > 0) {
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for (int j = 0; j < mparams.Count; j++) {
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block.insert(n++, create(OpCodes.Ldloc, new Operand(Operand.Type.TempObjArray)));
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block.insert(n++, Instruction.Create(OpCodes.Ldc_I4, j));
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block.insert(n++, Instruction.Create(OpCodes.Ldelem_Ref));
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var argType = mparams[j];
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if (argType.IsValueType)
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block.insert(n++, Instruction.Create(OpCodes.Unbox_Any, argType));
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else
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block.insert(n++, Instruction.Create(OpCodes.Castclass, argType));
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}
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}
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insertLoadThis(block, n++);
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block.insert(n++, create(OpCodes.Call, new Operand(Operand.Type.NewMethod, method.methodBase)));
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i = n - 1;
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continue;
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}
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}
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}
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}
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static List<TypeReference> getParameters(MethodDefinition method) {
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int count = method.Parameters.Count + (method.HasThis ? 1 : 0);
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var list = new List<TypeReference>(count);
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if (method.HasThis)
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list.Add(method.DeclaringType);
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foreach (var argType in method.Parameters)
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list.Add(argType.ParameterType);
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return list;
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}
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// Called after the StackTrace ctor has been called.
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static StackTrace static_rtFixStackTrace(StackTrace stackTrace, MethodsRewriter self) {
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return self.rtFixStackTrace(stackTrace);
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}
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StackTrace rtFixStackTrace(StackTrace stackTrace) {
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//TODO:
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return stackTrace;
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}
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// Called when the code calls GetCallingAssembly(), GetEntryAssembly(), or GetExecutingAssembly()
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Assembly rtGetAssembly(int delegateIndex) {
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return newMethodInfos[delegateIndex].oldMethod.Module.Assembly;
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}
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// Called when the code calls GetAssembly(Type)
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static Assembly static_rtGetAssembly_TypeArg(Type type, MethodsRewriter self) {
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return self.rtGetAssembly_TypeArg(type);
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}
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Assembly rtGetAssembly_TypeArg(Type type) {
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return Assembly.GetAssembly(type); //TODO:
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}
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Delegate rtGetDelegateInstance(int delegateIndex) {
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return newMethodInfos[delegateIndex].delegateInstance;
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}
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}
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}
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